The process for installing an electrical fuel gauge is simple indeed.
First-Purchase autometer electrical fuel pressure gauge and sender.
Second-Theres a direct fuel line located near the drivers side head. Theres a cover, unscrew that and replace it with the sender. You will need an adapter that fits the tap and the fuel sender. You may need minor fabrication to do so.
Third- Ensure the gauge is wired correctly and mounted to pod.
Fourth- Start your engine
Your fuel pressure shouldn't fluctuate much at all.
My fuel pressure stays at around 51 PSI even when driving and increase a tad bit at full throttle. Other than that your fuel pressure should stay very consistent.

I will be adding pics A.S.A.P